National Instruments DAQ X Series User Manual page 49

MIO X Series devices use a calibration method that requires some codes
(typically about 5% of the codes) to lie outside of the specified range. This
calibration method improves absolute accuracy, but it increases the nominal
resolution of input ranges by about 5% over what the formula shown above
would indicate.
Choose an input range that matches the expected input range of your signal.
A large input range can accommodate a large signal variation, but reduces
the voltage resolution. Choosing a smaller input range improves the voltage
resolution, but may result in the input signal going out of range.
For more information about setting ranges, refer to the NI-DAQmx Help or
the LabVIEW Help.
Table 4-1 shows the input ranges and resolutions supported by each MIO
X Series device.
Table 4-1. MIO X Series Device Input Range and Nominal Resolution
MIO X Series Device
NI 632x/634x
NI 6351/6353/6361/6363
© National Instruments
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Input Range
–10 V to 10 V
–5 V to 5 V
–1 V to 1 V
–200 mV to 200 mV
–10 V to 10 V
–5 V to 5 V
–2 V to 2 V
–1 V to 1 V
–500 mV to 500 mV
–200 mV to 200 mV
–100 mV to 100 mV
4-3
Chapter 4 Analog Input
Nominal Resolution Assuming
5% Over Range
320 μV
160 μV
32 μV
6.4 μV
320 μV
160 μV
64 μV
32 μV
16 μV
6.4 μV
3.2 μV
X Series User Manual